nvme-auth: fix off by one checks

The > ARRAY_SIZE() checks need to be >= ARRAY_SIZE() to prevent reading
one element beyond the end of the arrays.

Fixes: db1312dd ("nvmet: implement basic In-Band Authentication")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/nvme/common/auth.c

@@ -55,7 +55,7 @@ static struct nvme_auth_dhgroup_map {
 
 const char *nvme_auth_dhgroup_name(u8 dhgroup_id)
 {
-	if (dhgroup_id > ARRAY_SIZE(dhgroup_map))
+	if (dhgroup_id >= ARRAY_SIZE(dhgroup_map))
 		return NULL;
 	return dhgroup_map[dhgroup_id].name;
 }
@@ -63,7 +63,7 @@ EXPORT_SYMBOL_GPL(nvme_auth_dhgroup_name);
 
 const char *nvme_auth_dhgroup_kpp(u8 dhgroup_id)
 {
-	if (dhgroup_id > ARRAY_SIZE(dhgroup_map))
+	if (dhgroup_id >= ARRAY_SIZE(dhgroup_map))
 		return NULL;
 	return dhgroup_map[dhgroup_id].kpp;
 }
@@ -110,7 +110,7 @@ static struct nvme_dhchap_hash_map {
 
 const char *nvme_auth_hmac_name(u8 hmac_id)
 {
-	if (hmac_id > ARRAY_SIZE(hash_map))
+	if (hmac_id >= ARRAY_SIZE(hash_map))
 		return NULL;
 	return hash_map[hmac_id].hmac;
 }
@@ -118,7 +118,7 @@ EXPORT_SYMBOL_GPL(nvme_auth_hmac_name);
 
 const char *nvme_auth_digest_name(u8 hmac_id)
 {
-	if (hmac_id > ARRAY_SIZE(hash_map))
+	if (hmac_id >= ARRAY_SIZE(hash_map))
 		return NULL;
 	return hash_map[hmac_id].digest;
 }
@@ -144,7 +144,7 @@ EXPORT_SYMBOL_GPL(nvme_auth_hmac_id);
 
 size_t nvme_auth_hmac_hash_len(u8 hmac_id)
 {
-	if (hmac_id > ARRAY_SIZE(hash_map))
+	if (hmac_id >= ARRAY_SIZE(hash_map))
 		return 0;
 	return hash_map[hmac_id].len;
 }